A delegate of the Revolutionary Armed Forces of Colombia in Havana alerted The Associated Press to the music video. In it, Nijmeijer raps about how she's earned the trip.
The video segues into a ballad she sings about FARC field marshal Jorge Briceno, who was slain in a 2010 government bombing raid that Nijmeijer survived.
Last month's inauguration in Norway of talks to end Colombia's half-century-old conflict was delayed when the rebels insisted Nijmeijer attend. She didn't.
Nijmeijer is wanted in the United States on hostage-taking and terrorism charges.
The Cuba negotiations commence Nov. 15.